Question

Heena has only 2 and 5 rupees coins in her purse. If in all she has 80 coins amounting 232 find the number of 5 rupee coins?

Answer 1

Assume 2 rs coins as X

              5 rs coins as Y

  X+ Y=80-----(1)

2X+5Y=232---(2)

Eq. 1 multiplied by 2

2x+5y=232

-    -      -

2x+2y=160

________

  3y= 72

   Y= 24

Subs Y value in Eq. 1

X+24=80

 X=80-24

 X=56

Confirmation

Sub. X&Y value in Eq.2

  2(56)+5(24)=232

   112+120=232

   232=232

She may have 24, 5 rs coins in her purse